linux/arch/powerpc/platforms/cell/spufs/inode.c
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   1
   2/*
   3 * SPU file system
   4 *
   5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   6 *
   7 * Author: Arnd Bergmann <arndb@de.ibm.com>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2, or (at your option)
  12 * any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24#include <linux/file.h>
  25#include <linux/fs.h>
  26#include <linux/fsnotify.h>
  27#include <linux/backing-dev.h>
  28#include <linux/init.h>
  29#include <linux/ioctl.h>
  30#include <linux/module.h>
  31#include <linux/mount.h>
  32#include <linux/namei.h>
  33#include <linux/pagemap.h>
  34#include <linux/poll.h>
  35#include <linux/slab.h>
  36#include <linux/parser.h>
  37
  38#include <asm/prom.h>
  39#include <asm/spu.h>
  40#include <asm/spu_priv1.h>
  41#include <linux/uaccess.h>
  42
  43#include "spufs.h"
  44
  45struct spufs_sb_info {
  46        int debug;
  47};
  48
  49static struct kmem_cache *spufs_inode_cache;
  50char *isolated_loader;
  51static int isolated_loader_size;
  52
  53static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
  54{
  55        return sb->s_fs_info;
  56}
  57
  58static struct inode *
  59spufs_alloc_inode(struct super_block *sb)
  60{
  61        struct spufs_inode_info *ei;
  62
  63        ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
  64        if (!ei)
  65                return NULL;
  66
  67        ei->i_gang = NULL;
  68        ei->i_ctx = NULL;
  69        ei->i_openers = 0;
  70
  71        return &ei->vfs_inode;
  72}
  73
  74static void spufs_i_callback(struct rcu_head *head)
  75{
  76        struct inode *inode = container_of(head, struct inode, i_rcu);
  77        kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  78}
  79
  80static void spufs_destroy_inode(struct inode *inode)
  81{
  82        call_rcu(&inode->i_rcu, spufs_i_callback);
  83}
  84
  85static void
  86spufs_init_once(void *p)
  87{
  88        struct spufs_inode_info *ei = p;
  89
  90        inode_init_once(&ei->vfs_inode);
  91}
  92
  93static struct inode *
  94spufs_new_inode(struct super_block *sb, umode_t mode)
  95{
  96        struct inode *inode;
  97
  98        inode = new_inode(sb);
  99        if (!inode)
 100                goto out;
 101
 102        inode->i_ino = get_next_ino();
 103        inode->i_mode = mode;
 104        inode->i_uid = current_fsuid();
 105        inode->i_gid = current_fsgid();
 106        inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 107out:
 108        return inode;
 109}
 110
 111static int
 112spufs_setattr(struct dentry *dentry, struct iattr *attr)
 113{
 114        struct inode *inode = d_inode(dentry);
 115
 116        if ((attr->ia_valid & ATTR_SIZE) &&
 117            (attr->ia_size != inode->i_size))
 118                return -EINVAL;
 119        setattr_copy(inode, attr);
 120        mark_inode_dirty(inode);
 121        return 0;
 122}
 123
 124
 125static int
 126spufs_new_file(struct super_block *sb, struct dentry *dentry,
 127                const struct file_operations *fops, umode_t mode,
 128                size_t size, struct spu_context *ctx)
 129{
 130        static const struct inode_operations spufs_file_iops = {
 131                .setattr = spufs_setattr,
 132        };
 133        struct inode *inode;
 134        int ret;
 135
 136        ret = -ENOSPC;
 137        inode = spufs_new_inode(sb, S_IFREG | mode);
 138        if (!inode)
 139                goto out;
 140
 141        ret = 0;
 142        inode->i_op = &spufs_file_iops;
 143        inode->i_fop = fops;
 144        inode->i_size = size;
 145        inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 146        d_add(dentry, inode);
 147out:
 148        return ret;
 149}
 150
 151static void
 152spufs_evict_inode(struct inode *inode)
 153{
 154        struct spufs_inode_info *ei = SPUFS_I(inode);
 155        clear_inode(inode);
 156        if (ei->i_ctx)
 157                put_spu_context(ei->i_ctx);
 158        if (ei->i_gang)
 159                put_spu_gang(ei->i_gang);
 160}
 161
 162static void spufs_prune_dir(struct dentry *dir)
 163{
 164        struct dentry *dentry, *tmp;
 165
 166        inode_lock(d_inode(dir));
 167        list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
 168                spin_lock(&dentry->d_lock);
 169                if (simple_positive(dentry)) {
 170                        dget_dlock(dentry);
 171                        __d_drop(dentry);
 172                        spin_unlock(&dentry->d_lock);
 173                        simple_unlink(d_inode(dir), dentry);
 174                        /* XXX: what was dcache_lock protecting here? Other
 175                         * filesystems (IB, configfs) release dcache_lock
 176                         * before unlink */
 177                        dput(dentry);
 178                } else {
 179                        spin_unlock(&dentry->d_lock);
 180                }
 181        }
 182        shrink_dcache_parent(dir);
 183        inode_unlock(d_inode(dir));
 184}
 185
 186/* Caller must hold parent->i_mutex */
 187static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 188{
 189        /* remove all entries */
 190        int res;
 191        spufs_prune_dir(dir);
 192        d_drop(dir);
 193        res = simple_rmdir(parent, dir);
 194        /* We have to give up the mm_struct */
 195        spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
 196        return res;
 197}
 198
 199static int spufs_fill_dir(struct dentry *dir,
 200                const struct spufs_tree_descr *files, umode_t mode,
 201                struct spu_context *ctx)
 202{
 203        while (files->name && files->name[0]) {
 204                int ret;
 205                struct dentry *dentry = d_alloc_name(dir, files->name);
 206                if (!dentry)
 207                        return -ENOMEM;
 208                ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 209                                        files->mode & mode, files->size, ctx);
 210                if (ret)
 211                        return ret;
 212                files++;
 213        }
 214        return 0;
 215}
 216
 217static int spufs_dir_close(struct inode *inode, struct file *file)
 218{
 219        struct spu_context *ctx;
 220        struct inode *parent;
 221        struct dentry *dir;
 222        int ret;
 223
 224        dir = file->f_path.dentry;
 225        parent = d_inode(dir->d_parent);
 226        ctx = SPUFS_I(d_inode(dir))->i_ctx;
 227
 228        inode_lock_nested(parent, I_MUTEX_PARENT);
 229        ret = spufs_rmdir(parent, dir);
 230        inode_unlock(parent);
 231        WARN_ON(ret);
 232
 233        return dcache_dir_close(inode, file);
 234}
 235
 236const struct file_operations spufs_context_fops = {
 237        .open           = dcache_dir_open,
 238        .release        = spufs_dir_close,
 239        .llseek         = dcache_dir_lseek,
 240        .read           = generic_read_dir,
 241        .iterate_shared = dcache_readdir,
 242        .fsync          = noop_fsync,
 243};
 244EXPORT_SYMBOL_GPL(spufs_context_fops);
 245
 246static int
 247spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 248                umode_t mode)
 249{
 250        int ret;
 251        struct inode *inode;
 252        struct spu_context *ctx;
 253
 254        inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 255        if (!inode)
 256                return -ENOSPC;
 257
 258        if (dir->i_mode & S_ISGID) {
 259                inode->i_gid = dir->i_gid;
 260                inode->i_mode &= S_ISGID;
 261        }
 262        ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 263        SPUFS_I(inode)->i_ctx = ctx;
 264        if (!ctx) {
 265                iput(inode);
 266                return -ENOSPC;
 267        }
 268
 269        ctx->flags = flags;
 270        inode->i_op = &simple_dir_inode_operations;
 271        inode->i_fop = &simple_dir_operations;
 272
 273        inode_lock(inode);
 274
 275        dget(dentry);
 276        inc_nlink(dir);
 277        inc_nlink(inode);
 278
 279        d_instantiate(dentry, inode);
 280
 281        if (flags & SPU_CREATE_NOSCHED)
 282                ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 283                                         mode, ctx);
 284        else
 285                ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 286
 287        if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
 288                ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 289                                mode, ctx);
 290
 291        if (ret)
 292                spufs_rmdir(dir, dentry);
 293
 294        inode_unlock(inode);
 295
 296        return ret;
 297}
 298
 299static int spufs_context_open(struct path *path)
 300{
 301        int ret;
 302        struct file *filp;
 303
 304        ret = get_unused_fd_flags(0);
 305        if (ret < 0)
 306                return ret;
 307
 308        filp = dentry_open(path, O_RDONLY, current_cred());
 309        if (IS_ERR(filp)) {
 310                put_unused_fd(ret);
 311                return PTR_ERR(filp);
 312        }
 313
 314        filp->f_op = &spufs_context_fops;
 315        fd_install(ret, filp);
 316        return ret;
 317}
 318
 319static struct spu_context *
 320spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 321                                                struct file *filp)
 322{
 323        struct spu_context *tmp, *neighbor, *err;
 324        int count, node;
 325        int aff_supp;
 326
 327        aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 328                                        struct spu, cbe_list))->aff_list);
 329
 330        if (!aff_supp)
 331                return ERR_PTR(-EINVAL);
 332
 333        if (flags & SPU_CREATE_GANG)
 334                return ERR_PTR(-EINVAL);
 335
 336        if (flags & SPU_CREATE_AFFINITY_MEM &&
 337            gang->aff_ref_ctx &&
 338            gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 339                return ERR_PTR(-EEXIST);
 340
 341        if (gang->aff_flags & AFF_MERGED)
 342                return ERR_PTR(-EBUSY);
 343
 344        neighbor = NULL;
 345        if (flags & SPU_CREATE_AFFINITY_SPU) {
 346                if (!filp || filp->f_op != &spufs_context_fops)
 347                        return ERR_PTR(-EINVAL);
 348
 349                neighbor = get_spu_context(
 350                                SPUFS_I(file_inode(filp))->i_ctx);
 351
 352                if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 353                    !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 354                    !list_entry(neighbor->aff_list.next, struct spu_context,
 355                    aff_list)->aff_head) {
 356                        err = ERR_PTR(-EEXIST);
 357                        goto out_put_neighbor;
 358                }
 359
 360                if (gang != neighbor->gang) {
 361                        err = ERR_PTR(-EINVAL);
 362                        goto out_put_neighbor;
 363                }
 364
 365                count = 1;
 366                list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 367                        count++;
 368                if (list_empty(&neighbor->aff_list))
 369                        count++;
 370
 371                for (node = 0; node < MAX_NUMNODES; node++) {
 372                        if ((cbe_spu_info[node].n_spus - atomic_read(
 373                                &cbe_spu_info[node].reserved_spus)) >= count)
 374                                break;
 375                }
 376
 377                if (node == MAX_NUMNODES) {
 378                        err = ERR_PTR(-EEXIST);
 379                        goto out_put_neighbor;
 380                }
 381        }
 382
 383        return neighbor;
 384
 385out_put_neighbor:
 386        put_spu_context(neighbor);
 387        return err;
 388}
 389
 390static void
 391spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 392                                        struct spu_context *neighbor)
 393{
 394        if (flags & SPU_CREATE_AFFINITY_MEM)
 395                ctx->gang->aff_ref_ctx = ctx;
 396
 397        if (flags & SPU_CREATE_AFFINITY_SPU) {
 398                if (list_empty(&neighbor->aff_list)) {
 399                        list_add_tail(&neighbor->aff_list,
 400                                &ctx->gang->aff_list_head);
 401                        neighbor->aff_head = 1;
 402                }
 403
 404                if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 405                    || list_entry(neighbor->aff_list.next, struct spu_context,
 406                                                        aff_list)->aff_head) {
 407                        list_add(&ctx->aff_list, &neighbor->aff_list);
 408                } else  {
 409                        list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 410                        if (neighbor->aff_head) {
 411                                neighbor->aff_head = 0;
 412                                ctx->aff_head = 1;
 413                        }
 414                }
 415
 416                if (!ctx->gang->aff_ref_ctx)
 417                        ctx->gang->aff_ref_ctx = ctx;
 418        }
 419}
 420
 421static int
 422spufs_create_context(struct inode *inode, struct dentry *dentry,
 423                        struct vfsmount *mnt, int flags, umode_t mode,
 424                        struct file *aff_filp)
 425{
 426        int ret;
 427        int affinity;
 428        struct spu_gang *gang;
 429        struct spu_context *neighbor;
 430        struct path path = {.mnt = mnt, .dentry = dentry};
 431
 432        if ((flags & SPU_CREATE_NOSCHED) &&
 433            !capable(CAP_SYS_NICE))
 434                return -EPERM;
 435
 436        if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 437            == SPU_CREATE_ISOLATE)
 438                return -EINVAL;
 439
 440        if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 441                return -ENODEV;
 442
 443        gang = NULL;
 444        neighbor = NULL;
 445        affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 446        if (affinity) {
 447                gang = SPUFS_I(inode)->i_gang;
 448                if (!gang)
 449                        return -EINVAL;
 450                mutex_lock(&gang->aff_mutex);
 451                neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 452                if (IS_ERR(neighbor)) {
 453                        ret = PTR_ERR(neighbor);
 454                        goto out_aff_unlock;
 455                }
 456        }
 457
 458        ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 459        if (ret)
 460                goto out_aff_unlock;
 461
 462        if (affinity) {
 463                spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
 464                                                                neighbor);
 465                if (neighbor)
 466                        put_spu_context(neighbor);
 467        }
 468
 469        ret = spufs_context_open(&path);
 470        if (ret < 0)
 471                WARN_ON(spufs_rmdir(inode, dentry));
 472
 473out_aff_unlock:
 474        if (affinity)
 475                mutex_unlock(&gang->aff_mutex);
 476        return ret;
 477}
 478
 479static int
 480spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
 481{
 482        int ret;
 483        struct inode *inode;
 484        struct spu_gang *gang;
 485
 486        ret = -ENOSPC;
 487        inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 488        if (!inode)
 489                goto out;
 490
 491        ret = 0;
 492        if (dir->i_mode & S_ISGID) {
 493                inode->i_gid = dir->i_gid;
 494                inode->i_mode &= S_ISGID;
 495        }
 496        gang = alloc_spu_gang();
 497        SPUFS_I(inode)->i_ctx = NULL;
 498        SPUFS_I(inode)->i_gang = gang;
 499        if (!gang) {
 500                ret = -ENOMEM;
 501                goto out_iput;
 502        }
 503
 504        inode->i_op = &simple_dir_inode_operations;
 505        inode->i_fop = &simple_dir_operations;
 506
 507        d_instantiate(dentry, inode);
 508        inc_nlink(dir);
 509        inc_nlink(d_inode(dentry));
 510        return ret;
 511
 512out_iput:
 513        iput(inode);
 514out:
 515        return ret;
 516}
 517
 518static int spufs_gang_open(struct path *path)
 519{
 520        int ret;
 521        struct file *filp;
 522
 523        ret = get_unused_fd_flags(0);
 524        if (ret < 0)
 525                return ret;
 526
 527        /*
 528         * get references for dget and mntget, will be released
 529         * in error path of *_open().
 530         */
 531        filp = dentry_open(path, O_RDONLY, current_cred());
 532        if (IS_ERR(filp)) {
 533                put_unused_fd(ret);
 534                return PTR_ERR(filp);
 535        }
 536
 537        filp->f_op = &simple_dir_operations;
 538        fd_install(ret, filp);
 539        return ret;
 540}
 541
 542static int spufs_create_gang(struct inode *inode,
 543                        struct dentry *dentry,
 544                        struct vfsmount *mnt, umode_t mode)
 545{
 546        struct path path = {.mnt = mnt, .dentry = dentry};
 547        int ret;
 548
 549        ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 550        if (!ret) {
 551                ret = spufs_gang_open(&path);
 552                if (ret < 0) {
 553                        int err = simple_rmdir(inode, dentry);
 554                        WARN_ON(err);
 555                }
 556        }
 557        return ret;
 558}
 559
 560
 561static struct file_system_type spufs_type;
 562
 563long spufs_create(struct path *path, struct dentry *dentry,
 564                unsigned int flags, umode_t mode, struct file *filp)
 565{
 566        struct inode *dir = d_inode(path->dentry);
 567        int ret;
 568
 569        /* check if we are on spufs */
 570        if (path->dentry->d_sb->s_type != &spufs_type)
 571                return -EINVAL;
 572
 573        /* don't accept undefined flags */
 574        if (flags & (~SPU_CREATE_FLAG_ALL))
 575                return -EINVAL;
 576
 577        /* only threads can be underneath a gang */
 578        if (path->dentry != path->dentry->d_sb->s_root)
 579                if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
 580                        return -EINVAL;
 581
 582        mode &= ~current_umask();
 583
 584        if (flags & SPU_CREATE_GANG)
 585                ret = spufs_create_gang(dir, dentry, path->mnt, mode);
 586        else
 587                ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
 588                                            filp);
 589        if (ret >= 0)
 590                fsnotify_mkdir(dir, dentry);
 591
 592        return ret;
 593}
 594
 595/* File system initialization */
 596enum {
 597        Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 598};
 599
 600static const match_table_t spufs_tokens = {
 601        { Opt_uid,   "uid=%d" },
 602        { Opt_gid,   "gid=%d" },
 603        { Opt_mode,  "mode=%o" },
 604        { Opt_debug, "debug" },
 605        { Opt_err,    NULL  },
 606};
 607
 608static int spufs_show_options(struct seq_file *m, struct dentry *root)
 609{
 610        struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
 611        struct inode *inode = root->d_inode;
 612
 613        if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
 614                seq_printf(m, ",uid=%u",
 615                           from_kuid_munged(&init_user_ns, inode->i_uid));
 616        if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
 617                seq_printf(m, ",gid=%u",
 618                           from_kgid_munged(&init_user_ns, inode->i_gid));
 619        if ((inode->i_mode & S_IALLUGO) != 0775)
 620                seq_printf(m, ",mode=%o", inode->i_mode);
 621        if (sbi->debug)
 622                seq_puts(m, ",debug");
 623        return 0;
 624}
 625
 626static int
 627spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 628{
 629        char *p;
 630        substring_t args[MAX_OPT_ARGS];
 631
 632        while ((p = strsep(&options, ",")) != NULL) {
 633                int token, option;
 634
 635                if (!*p)
 636                        continue;
 637
 638                token = match_token(p, spufs_tokens, args);
 639                switch (token) {
 640                case Opt_uid:
 641                        if (match_int(&args[0], &option))
 642                                return 0;
 643                        root->i_uid = make_kuid(current_user_ns(), option);
 644                        if (!uid_valid(root->i_uid))
 645                                return 0;
 646                        break;
 647                case Opt_gid:
 648                        if (match_int(&args[0], &option))
 649                                return 0;
 650                        root->i_gid = make_kgid(current_user_ns(), option);
 651                        if (!gid_valid(root->i_gid))
 652                                return 0;
 653                        break;
 654                case Opt_mode:
 655                        if (match_octal(&args[0], &option))
 656                                return 0;
 657                        root->i_mode = option | S_IFDIR;
 658                        break;
 659                case Opt_debug:
 660                        spufs_get_sb_info(sb)->debug = 1;
 661                        break;
 662                default:
 663                        return 0;
 664                }
 665        }
 666        return 1;
 667}
 668
 669static void spufs_exit_isolated_loader(void)
 670{
 671        free_pages((unsigned long) isolated_loader,
 672                        get_order(isolated_loader_size));
 673}
 674
 675static void
 676spufs_init_isolated_loader(void)
 677{
 678        struct device_node *dn;
 679        const char *loader;
 680        int size;
 681
 682        dn = of_find_node_by_path("/spu-isolation");
 683        if (!dn)
 684                return;
 685
 686        loader = of_get_property(dn, "loader", &size);
 687        if (!loader)
 688                return;
 689
 690        /* the loader must be align on a 16 byte boundary */
 691        isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 692        if (!isolated_loader)
 693                return;
 694
 695        isolated_loader_size = size;
 696        memcpy(isolated_loader, loader, size);
 697        printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 698}
 699
 700static int
 701spufs_create_root(struct super_block *sb, void *data)
 702{
 703        struct inode *inode;
 704        int ret;
 705
 706        ret = -ENODEV;
 707        if (!spu_management_ops)
 708                goto out;
 709
 710        ret = -ENOMEM;
 711        inode = spufs_new_inode(sb, S_IFDIR | 0775);
 712        if (!inode)
 713                goto out;
 714
 715        inode->i_op = &simple_dir_inode_operations;
 716        inode->i_fop = &simple_dir_operations;
 717        SPUFS_I(inode)->i_ctx = NULL;
 718        inc_nlink(inode);
 719
 720        ret = -EINVAL;
 721        if (!spufs_parse_options(sb, data, inode))
 722                goto out_iput;
 723
 724        ret = -ENOMEM;
 725        sb->s_root = d_make_root(inode);
 726        if (!sb->s_root)
 727                goto out;
 728
 729        return 0;
 730out_iput:
 731        iput(inode);
 732out:
 733        return ret;
 734}
 735
 736static int
 737spufs_fill_super(struct super_block *sb, void *data, int silent)
 738{
 739        struct spufs_sb_info *info;
 740        static const struct super_operations s_ops = {
 741                .alloc_inode = spufs_alloc_inode,
 742                .destroy_inode = spufs_destroy_inode,
 743                .statfs = simple_statfs,
 744                .evict_inode = spufs_evict_inode,
 745                .show_options = spufs_show_options,
 746        };
 747
 748        info = kzalloc(sizeof(*info), GFP_KERNEL);
 749        if (!info)
 750                return -ENOMEM;
 751
 752        sb->s_maxbytes = MAX_LFS_FILESIZE;
 753        sb->s_blocksize = PAGE_SIZE;
 754        sb->s_blocksize_bits = PAGE_SHIFT;
 755        sb->s_magic = SPUFS_MAGIC;
 756        sb->s_op = &s_ops;
 757        sb->s_fs_info = info;
 758
 759        return spufs_create_root(sb, data);
 760}
 761
 762static struct dentry *
 763spufs_mount(struct file_system_type *fstype, int flags,
 764                const char *name, void *data)
 765{
 766        return mount_single(fstype, flags, data, spufs_fill_super);
 767}
 768
 769static struct file_system_type spufs_type = {
 770        .owner = THIS_MODULE,
 771        .name = "spufs",
 772        .mount = spufs_mount,
 773        .kill_sb = kill_litter_super,
 774};
 775MODULE_ALIAS_FS("spufs");
 776
 777static int __init spufs_init(void)
 778{
 779        int ret;
 780
 781        ret = -ENODEV;
 782        if (!spu_management_ops)
 783                goto out;
 784
 785        ret = -ENOMEM;
 786        spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 787                        sizeof(struct spufs_inode_info), 0,
 788                        SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
 789
 790        if (!spufs_inode_cache)
 791                goto out;
 792        ret = spu_sched_init();
 793        if (ret)
 794                goto out_cache;
 795        ret = register_spu_syscalls(&spufs_calls);
 796        if (ret)
 797                goto out_sched;
 798        ret = register_filesystem(&spufs_type);
 799        if (ret)
 800                goto out_syscalls;
 801
 802        spufs_init_isolated_loader();
 803
 804        return 0;
 805
 806out_syscalls:
 807        unregister_spu_syscalls(&spufs_calls);
 808out_sched:
 809        spu_sched_exit();
 810out_cache:
 811        kmem_cache_destroy(spufs_inode_cache);
 812out:
 813        return ret;
 814}
 815module_init(spufs_init);
 816
 817static void __exit spufs_exit(void)
 818{
 819        spu_sched_exit();
 820        spufs_exit_isolated_loader();
 821        unregister_spu_syscalls(&spufs_calls);
 822        unregister_filesystem(&spufs_type);
 823        kmem_cache_destroy(spufs_inode_cache);
 824}
 825module_exit(spufs_exit);
 826
 827MODULE_LICENSE("GPL");
 828MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 829
 830